The 4015 is a dual shift register that I usually just wire up to the panel.
You have 2 sets of clocks, data and resets that go to jacks. Each of these shifty fellas has 4 outs to send to various INs from other cmos or straight to an R/2R ladder, then a vco for fun. Even without an r/2r or vco, they are handy in creating unique patches.

Scroll down and you'll see the 4046 used as a pitch tracker and as a simple vco. Loads of fun and experimentation. One caveat: the 4046, as well as many cmos chips, can vary in performance in some of the more creative uses such as pitch tracking. Socket these positions so you can sub parts till you get the sound you're after._________________Zontar Prevails!

Should all of the inputs be high at the same time / oscillating at the same time? I'd like to see one of these action. Astroman, you should post a sound sample to Soundcloud and link it here!

Please tell if I'm right - is the 4046 in the schematic above like a quantizer? As in the input frequency is locked or held at a stable frequency? I should probably look into this more. But I'm just so fascinated about these CMOS chips. I'm to the point where I'm researching about them on my iPhone during breaks at work! _________________Vine username: "billsship"
Modulargrid

That schematic is using the built in vco; one of the simplest ways to use this chip. Pin 9 is the vco in and slacker's schematic has a resistor ladder connected to it. Connect the outs of a 4015 or other shift register (or any logic's outs) to that resistor ladder and enjoy the tunes.

When set up as a pitch tracker, you're using more of its built in stuff like the comparators. It can get real complicated real quick trying to describe the many uses of this chip. Like I mentioned before, there's always a price for the more unusual chips; mainly that the built in stuff (vco, comparators, rc networks, etc.) can vary between manufacturers so buy a bunch of em' and socket that mother.

I take the same approach when I build fuzz pedals; the parts may look the same but do they sound the same? Socket baby ! In the end, it's worth the trouble.

@RingMAd: I totally forgot about using the 4015 as you mentioned. Thanks for the tip ._________________Zontar Prevails!

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